Nuchal translucency and gestational age.
D004314:Down Syndrome / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000196:embryology; D005189:False Positive Reactions; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000196:embryology; D005865:Gestational Age; D006801:Humans; D009333:Neck / Q000000981:diagnostic imaging* / Q000196:embryology; D011247:Pregnancy; D011296:Prenatal Diagnosis; D016216:Ultrasonography, Prenatal / Q000379:methods